99 lines
3.6 KiB
C
99 lines
3.6 KiB
C
/****************************************************************************
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* sched/group/group_waiter.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/types.h>
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#include <assert.h>
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#include "nuttx/sched.h"
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#include "group/group.h"
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#if defined(CONFIG_SCHED_WAITPID) && !defined(CONFIG_SCHED_HAVE_PARENT)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: group_addwaiter
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*
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* Description:
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* Increment the number of instances of waitpid that are waiting for this
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* group to exit.
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*
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* Assumptions:
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* Caller has assured mutually exclusive access to the group.
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*
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****************************************************************************/
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void group_addwaiter(FAR struct task_group_s *group)
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{
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group->tg_nwaiters++;
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DEBUGASSERT(group->tg_nwaiters > 0);
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}
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/****************************************************************************
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* Name: group_addwaiter
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*
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* Description:
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* Decrement the number of instances of waitpid that are waiting for this
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* group to exit. If the count goes to zero and deletion is pending, the
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* call group_free to release the dangling resources.
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*
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* Assumptions:
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* Caller has assured mutually exclusive access to the group.
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*
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****************************************************************************/
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void group_delwaiter(FAR struct task_group_s *group)
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{
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DEBUGASSERT(group->tg_nwaiters > 0);
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group->tg_nwaiters--;
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if (group->tg_nwaiters == 0 && (group->tg_flags & GROUP_FLAG_DELETED) != 0)
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{
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/* Release the group container (all other resources have already been
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* freed).
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*/
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sched_kfree(group);
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}
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}
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#endif /* CONFIG_SCHED_WAITPID && !CONFIG_SCHED_HAVE_PARENT */
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